Alcohol Consumption Per Capita and Suicide: A Meta-Analysis.

IMPORTANCE

At the individual level, alcohol use is an established risk factor for suicide; however, it is unclear whether this is reflected at the population level. If alcohol consumption per capita (APC), a population-level metric of total alcohol consumption used in international frameworks to measure progress in reducing the harmful use of alcohol, is associated with suicide, it could prove to be a useful target for suicide prevention initiatives.

OBJECTIVE

To examine whether there is an association between APC and suicide mortality, and if there is, to evaluate whether it differs by sex.

DATA SOURCES

Embase, Medline, PsycINFO, and Web of Science were searched from database inception to February 24, 2025, for original quantitative studies that measured the association between APC and suicide.

STUDY SELECTION

Included studies consisted of (1) original quantitative studies with a longitudinal observational or cross-sectional ecological design, including pre-post designs; and (2) studies that provided a measure of association. A total of 304 records were initially identified.

DATA EXTRACTION AND SYNTHESIS

Data extraction was completed by 1 reviewer and cross-checked by a second review. Risk of bias was assessed using the Risk of Bias in Nonrandomized Studies of Exposure tool, and evidence quality was assessed using Grading of Recommendations, Assessment, Development, and Evaluations. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses reporting guideline was followed. A random-effects meta-analysis was conducted to obtain a pooled estimate of the association between APC and suicide mortality. The presence of a sex difference was assessed using a random-effects meta-regression.

MAIN OUTCOMES AND MEASURES

The association between APC, measured as alcohol consumed in liters per person, and the suicide mortality rate.

RESULTS

A total of 13 studies were included in the main analysis. It was found that, on the population level, every 1-L increase in APC was associated with an increase of 3.59% (95% CI, 2.38%-4.79%) in the suicide mortality rate. There was no evidence of a sex difference in the association of interest.

CONCLUSIONS AND RELEVANCE

In this systematic review and meta-analysis, an increase in APC was associated with an increase in the suicide mortality rate at the population level and that the association was similar across sexes. As such, APC may be a useful target to consider within comprehensive national suicide prevention strategies.